Sense 1large (vs. small), big (vs. little) -- (above average in size or number or quantity or magnitude or extent; "a large city"; "set out for the big city"; "a large sum"; "a big (or large) barn"; "a large family"; "big businesses"; "a big expenditure"; "a large number of newspapers"; "a big group of scientists"; "large areas of the world")

Sense 11big, large, magnanimous -- (generous and understanding and tolerant; "a heart big enough to hold no grudges"; "that's very big of you to be so forgiving"; "a large and generous spirit"; "a large heart"; "magnanimous toward his enemies")

INDIRECT (VIA generous) -> ungenerous, meanspirited -- (lacking in magnanimity; "it seems ungenerous to end this review of a splendid work of scholarship on a critical note"- Times Litt. Sup.; "a meanspirited man unwilling to forgive")

Sense 2big -- (significant; "graduation was a big day in his life") => important (vs. unimportant), of import -- (of great significance or value; "important people"; "the important questions of the day")

Sense 11big, large, magnanimous -- (generous and understanding and tolerant; "a heart big enough to hold no grudges"; "that's very big of you to be so forgiving"; "a large and generous spirit"; "a large heart"; "magnanimous toward his enemies") => generous (vs. ungenerous) -- (not petty in character and mind; "unusually generous in his judgment of people")